Atomic timeline

  • The Alchemists
    500 BCE

    The Alchemists

    He believed that the 2 principles Mercury and Sulfur formed all metals. He also tried to purify, mature ,certain materials.
  • Democritus
    400 BCE

    Democritus

    He believed that different types of tiny discrete particles formed all matter. Also, he never got married
  • Plato
    370

    Plato

    He theorized that indivisible elements shaped like triangle composed solid forms of matter. Also, he was a Greek philosopher.
  • Robert Boyle

    Robert Boyle

    Made the idea of atomism, also thought that everything was composed of very tiny particles. He was also born on January 25th 1627 at Lismore Castle.
  • Antone Lavoisier

    Antone Lavoisier

    He said that matter was conserved during chemical changes which connected to the grounding the law of conservation of mass. He also gave oxygen its name.
  • John Dalton

    John Dalton

    He said that all matter is made of atoms, he also published the first atomic theory. He was known as the father of chemistry.
  • Billiard Ball Model

    Billiard Ball Model

    The atom would be the ball like structure, as the concepts of atomic nucleus and electrons were unknown at the time.
  • Amedeo Avogadro

    Amedeo Avogadro

    He discovered the gas law, today known as Avogadro's law. He also had 6 childern.
  • Dmitri Mendeleev

    Dmitri Mendeleev

    He came up with the the theory that states that elements are arranged from there value of their atomic weight presents a clear periodicity of properties. He was 72 when he died.
  • J.J Thompson

    J.J Thompson

    He discovered that atoms were made up of smaller components. He discovered the "electrons " which proposed a model for the structure of the atom. He also won a nobel prize in physics.
  • Pierre and Marie Curie

    Pierre and Marie Curie

    They were a French physicist that discovered radium and powerful radioactive elements ,polonium. Marie Curie was the first female professor at Sorbonne University.
  • Plum Pudding Model

    Plum Pudding Model

    This model shows how an atom is similar to a plum pudding ,first positive in change (the pudding)with negative electrons (the plums ) scattered through it.
  • Albert Einstein

    Albert Einstein

    He mathematically predicted the size of both molecules and atoms. Also, he did not start talking until he was 4.
  • Robert Millikan

    Robert Millikan

    He discovered the charge of an individual electron. He also enjoyed playing tennis and golf.
  • Ernest Rutherford

    Ernest Rutherford

    He described an atom as dense ,tiny, and positively charged core called the nucleus. He was also was the 4th of 12 children.
  • Solar System Model

    Solar System Model

    This model represents an atom , and they are like tiny solar systems
  • Niels Bohr

    Niels Bohr

    Proposed that the hydrogen atom was based on the quantum theory that some physical quantities only take discrete values. Also, the worked on Manhattan project during World War 2.
  • Henry G.J Mosely

    Henry G.J Mosely

    He discovered the use of x-rays to study elements and redefine the periodic table. Also, he went to the University of Manchester.
  • Electron cloud Model

    Electron cloud Model

    This shows the area around an atom's nucleus, where electrons are most likely to be found.
  • James Chadwich

    James Chadwich

    He said that protons and electrons and another subatomic particle called a neutron make up an atom.